[x86] remove uses of magic macros for boot_params access

Instead of using magic macros for boot_params access, simply use the
boot_params structure.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
diff --git a/arch/x86/kernel/setup64.c b/arch/x86/kernel/setup64.c
index 1200aaa..ba91882 100644
--- a/arch/x86/kernel/setup64.c
+++ b/arch/x86/kernel/setup64.c
@@ -11,7 +11,6 @@
 #include <linux/bootmem.h>
 #include <linux/bitops.h>
 #include <linux/module.h>
-#include <asm/bootsetup.h>
 #include <asm/pda.h>
 #include <asm/pgtable.h>
 #include <asm/processor.h>
@@ -23,8 +22,9 @@
 #include <asm/percpu.h>
 #include <asm/proto.h>
 #include <asm/sections.h>
+#include <asm/setup.h>
 
-char x86_boot_params[BOOT_PARAM_SIZE] __initdata;
+struct boot_params __initdata boot_params;
 
 cpumask_t cpu_initialized __cpuinitdata = CPU_MASK_NONE;